OpenDSS Documentation

The dynamic simulation model is the one developed during the project development and follows the directives presented in previous reports (see Figure 7). This dynamic model also incorporates voltage regulation functions given its Volt-var integrated functionality. The structure of the developed model is shown in Figure 1. The structure is based on GE’s dynamic model reference [6]. Most of the component modules in the model have the same implementation as described in the GE’s model reference, with minor improvements and parameterization to match the lab test results, as will be described in Section III. In addition, a volt-var control function was added to the reactive power control model for IEEE 1547-2018 [7] compliance, which is the de facto interconnection requirement for distributed energy resources (DER).

Figure 7. Dynamic simulation model blocks for the WindGen object

Specifically for distribution system simulations, the converter model is updated to reflect the negative sequence performance of the WTG under unbalanced voltage condition, as shown in Figure 8. Further, the key parameter values are shown in Table 2. The yellow blocks are for positive sequence control, while the blue blocks are for negative sequence control. An angle rotation mechanism was added for better damping of the control. Finally, the module outputs Thevenin equivalent voltage output in all abc phases, Ea, Eb, and Ec. 

Figure 8. Updated converter model for distribution simulation

Table 4. Key parameter values for converter model